Grease-gun.



W. P. MILLER.

GREASE GUN. APPLICATION FILED JAN. 31, 1908.

Patented Feb. 7, 191 l.

WILLIAM P. MILLER, OF NEW YORK, N. Y.

GREASE-GUN.

Specification of Letters Patent.

Patented Feb. 7,1911.

Application filed January 31, 1908. Serial No. 413,567.

To all whom it may concern:

Be it known that I, WILLIAM P. MILLER, a citizen of the United States, and resident of the borough of Brooklyn, in the city and State of New York, have invented a new and useful Improvement in Grease-Guns, of which the following is a specification.

One object of my invention is to provide a gun from which the grease may be ejected in predetermined quantities and at a predetermined speed, thus avoiding the jerking action of the plunger so common in the ordinary grease guns, which results in inaccuracy and wastefulness, and also avoiding the slow action of a screw and nut device.

Another object of my invention is to provide means for very rapidly filling the barrel of the gun with even the heaviest kind of grease.

A further object is to provide a gun-in which grease may be carried at all times without danger of its being forced out by the jolt ing of the vehicleor the contact of the gun with other objects.

improvements in the form, construction and arrangement of the various parts of the gun for carrying out the above mentioned objccts.v I

A practical embodiment of my invention is represented in the accompanying drawings in which- Figure 1 is a side elevation of the gun, Fig. 2 is a vertical central section of ,the same, Fig. 3 is a plan view of the cap, Fig: 4 is a vertical section through the same,

Fig. 5 is a horizontal section taken in the' plane of the line AA of Fig. 2, looking in the direction of the arrows, and Fig. 6 is a detail vertical central section of the nozzle.

The barrel of the gun is denoted by-l and it'is provided at its inner'end with a cap 2- and at its outer end with a removable nozzle composed of the parts 3 and 4. In the present instanceI have shown the cap 2 removably :secured to the barrel by the well known bayonet look. I have also shownv the part 4 ofthe nozzle exteriorly sc'rewthreaded atone end for engaging with the part 3, and part 3 interiorly screw-threaded for a distance for engagement with the barrel. 1. Both the cap 2 and the part 3 of the nozzle, I have shown provided with vmilled surfaces for facilitating the turning of the parts.

' the operation is as follows. 7 A still further object is to provide certain The plungerhead is constructed in any well known or approved form and com-- prises, in the present instance, stiff disks 5 and an interposed cup washer 6. These parts are secured to the shank 7 of the plun-' ger in the present instance, by the nut 8 engaging with a screw-thread on the shank 7.

The plunger is fitted to reciprocate in the barrel and have a substantially air-tight engagement with the inner wall thereof.

The cap '2 is provided with a central opening on the inner wall of which are one or more spiral lugs 9, in the present instance two, arranged diametrically opposite each other.. The shank 7 of the plunger passes through the opening in the cap 2, and it is provided with one or more spiral grooves 10 for engaging the lugs '9. These spiral lugs 9 insure an extended engagement of the shank with the cap 2. ,The outer end of the shank 7, I provide with a handle 11 rigidly fixed thereto, for manually operating the plunger.

When it is desired to make use of the gun, The part 3 of the nozzle is unscrewed from the barrel 1, the gun is held with the handle 11 project ing downwardly and the plunger. is permitted to slide down to its extreme inward position. The barrel is then easily and rapidly filled with grease from the open outer end and the nozzle is replaced. The gun is now ready for use. By turning the handle 11 in the proper direction, the plunger head is caused to advance as a result of the coaction of the spiral lugs 9 and the spiral groove 10. Thus a positive discharging acof its inward movement when the gun is held with the handle projecting downwardly, thus obviating the tedious and slow process of unscrewing the plunger as in guns having screw-threaded plungers, heretofore in use; and this pitch of the spiral groove also permits the rapid discharge of the grease by a few turns of the handle,

when desired. Moreover, the lubricant can bev positively ejected without danger of vwaste and in just the quantity desired; Itis to. be understood that I do not limit my sel f strictly. to the construction herein 75' described and shown as various changes might be resorted to without departing from the spirit and scope of my invention.

' What I claim is:

A grease gun comprising a barrel, a plun- 10 ger having its shank provided with a spiral groove, and means on said barrel engaging said groove for reciprocating the' plunger as the shank is rotated, the said groove be; ing of such pitch that longitudinal pressure on the plunger will cause the same to move 15 longitudinal y of the-barrel.

In testimony; that I claim the foregoing as my invention, I have signed my name in presence oftwo witnesses, this thirtieth day of January 1908.

WILLIAM P. MILLER.

Witnesses:

F. GEORGE BARRY, HENRY THIEME. 

